单词	nitrogen
释义	nitrogennitrogen /ˈnaɪtrədʒən/ ●●○ noun [uncountable] (symbol N) Etymology ETYMOLOGYnitrogen Origin: 1700-1800 French nitrogène, from nitre ( ➔ NITIC ACID) + -gène producing science, chemistry a gas that is an element, has no color or smell, and is the main part of the Earth’s air
随便看	encryption encumber encumbrance -ency encyclopedia encyclopedic end endanger endangered endangered species Endangered Species Act, the endear endearing endearingly endearment endeavor endemic endemic species endgame ending endive endless endlessly endocrine endocrine gland

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